Migration sql changes (#199)

* safe migration script changes

* lamassu migration script fixes

migrations/037-add_compliance_authorizations_table.js

@@ -1,9 +1,9 @@
 var db = require('./db')
 
 exports.up = function (next) {
-  const sql =
-    [ "create type compliance_types  as enum ('manual', 'sanctions', 'sanctions_override')",
-      `create table compliance_authorizations (
+  const sql = [
+    db.defineEnum('compliance_types', "'manual', 'sanctions', 'sanctions_override'"),
+    `create table if not exists compliance_authorizations (
     id uuid PRIMARY KEY,
     customer_id uuid REFERENCES customers (id),
     compliance_type compliance_types NOT NULL,